在下列哪一种情况不应该见到上腹部搏动（）。

A.右侧胸腔积液

B.腹主动脉瘤

C.肝血管瘤

D.二尖瓣狭窄

E.三尖瓣关闭不全

In the foreign trade business, the payment is always made by L/
C．In this sentence, L/C is the abbreviation for ______.

A．bill of Lading
B．commercial Invoice
C．buying Contract
D．letter of Credit